Add discount per item for invoice

app/Models/Sale/InvoiceItem.php

@@ -17,7 +17,18 @@ class InvoiceItem extends Model
      *
      * @var array
      */
-    protected $fillable = ['company_id', 'invoice_id', 'item_id', 'name', 'quantity', 'price', 'total', 'tax'];
+    protected $fillable = [
+        'company_id',
+        'invoice_id',
+        'item_id',
+        'name',
+        'quantity',
+        'price',
+        'total',
+        'tax',
+        'discount_rate',
+        'discount_type',
+    ];
 
     /**
      * Clonable relationships.
@@ -83,6 +94,22 @@ class InvoiceItem extends Model
         $this->attributes['tax'] = (double) $value;
     }
 
+    /**
+     * Get the formatted discount.
+     *
+     * @return string
+     */
+    public function getDiscountRateAttribute($value)
+    {
+        if (setting('localisation.percent_position', 'after') === 'after') {
+            $text = ($this->discount_type === 'normal') ? $value . '%' : $value;
+        } else {
+            $text = ($this->discount_type === 'normal') ? '%' . $value : $value;
+        }
+
+        return $text;
+    }
+
     /**
      * Convert tax to Array.
      *

app/Models/Sale/InvoiceItemDiscount.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Models\Sale;
+
+use App\Abstracts\Model;
+use App\Traits\Currencies;
+use Znck\Eloquent\Traits\BelongsToThrough;
+
+class InvoiceItemDiscount extends Model
+{
+    use Currencies, BelongsToThrough;
+
+    protected $table = 'invoice_item_discounts';
+
+    /**
+     * Attributes that should be mass-assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['company_id', 'invoice_id', 'invoice_item_id', 'rate', 'type', 'name', 'amount'];
+
+    public function invoice()
+    {
+        return $this->belongsTo('App\Models\Sale\Invoice');
+    }
+
+    public function item()
+    {
+        return $this->belongsToThrough('App\Models\Common\Item', 'App\Models\Sale\InvoiceItem', 'invoice_item_id')->withDefault(['name' => trans('general.na')]);
+    }
+
+    /**
+     * Convert rate to double.
+     *
+     * @param  string  $value
+     * @return void
+     */
+    public function setRateAttribute($value)
+    {
+        $this->attributes['rate'] = (double) $value;
+    }
+}